function showList(){
document.getElementById("prolist").style.display = "block";
document.getElementById("product_nav").className = "selected";
}
function hideList(){
document.getElementById("prolist").style.display = "none";
document.getElementById("product_nav").className = "";
}
/*
window.onload = function () {
var product_nav = document.getElementById('product_nav');
product_nav.onmouseover = function () {
showList();
}
product_nav.onmouseout = function () {
hideList();
}
} 
*/